i would think it would be spasms but when you squeeze a fist to try to stop it and it doesn't then you should check it out with a doc. my opinion would be get sleep some times when i get like 2 hours of sleep(doesn't happen every often) my eyelid twitches that day occasionally and thats from sleep deprivation, but i make sure to get 7.5-8.5 hours of sleep a night